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<title>DOM and Shadow DOM: Document.prototype.importNode</title>
<meta name="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org">
<meta name="assert" content="The importNode(node, deep) method must throw a NotSupportedError exception if node is a shadow root.">
<link rel="help" href="https://dom.spec.whatwg.org/#dom-document-importnode">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
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<body>
<div id="log"></div>
<script>

function testImportNode(mode) {
    test(function () {
        var newDocument = document.implementation.createHTMLDocument();
        assert_throws_dom('NotSupportedError', function () {
            var element = document.createElement('div');
            var shadowRoot = element.attachShadow({mode: mode});
            newDocument.importNode(shadowRoot);
        });
    }, 'importNode on a shadow root in ' + mode + ' mode must throw a NotSupportedError');
}

testImportNode('open');
testImportNode('closed');

</script>
</body>
</html>
